org.springframework.jmx.support

Class MBeanServerFactoryBean

java.lang.Object

org.springframework.jmx.support.MBeanServerFactoryBean

All Implemented Interfaces:

DisposableBean, FactoryBean<MBeanServer>, InitializingBean

public class MBeanServerFactoryBean
extends Object
implements FactoryBean<MBeanServer>, InitializingBean, DisposableBean

FactoryBean that obtains an MBeanServer reference through the standard JMX 1.2 MBeanServerFactory API (which is available on JDK 1.5 or as part of a JMX 1.2 provider). Exposes the MBeanServer for bean references.

By default, MBeanServerFactoryBean will always create a new MBeanServer even if one is already running. To have the MBeanServerFactoryBean attempt to locate a running MBeanServer first, set the value of the "locateExistingServerIfPossible" property to "true".

Since:

1.2

Author:

Rob Harrop, Juergen Hoeller

See Also:

setLocateExistingServerIfPossible(boolean), locateMBeanServer(java.lang.String), MBeanServer, MBeanServerFactory.findMBeanServer(java.lang.String), MBeanServerFactory.createMBeanServer(), MBeanServerFactory.newMBeanServer(), MBeanServerConnectionFactoryBean, ConnectorServerFactoryBean

Field Summary

Fields

Modifier and Type	Field and Description
protected Log	logger

Fields inherited from interface org.springframework.beans.factory.FactoryBean

OBJECT_TYPE_ATTRIBUTE

Constructor Summary

Constructors

Constructor and Description
MBeanServerFactoryBean()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Creates the MBeanServer instance.
protected MBeanServer	createMBeanServer(String defaultDomain, boolean registerWithFactory) Create a new MBeanServer instance and register it with the MBeanServerFactory, if desired.
void	destroy() Unregisters the MBeanServer instance, if necessary.
MBeanServer	getObject() Return an instance (possibly shared or independent) of the object managed by this factory.
Class<? extends MBeanServer>	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton() Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?
protected MBeanServer	locateMBeanServer(String agentId) Attempt to locate an existing MBeanServer.
void	setAgentId(String agentId) Set the agent id of the MBeanServer to locate.
void	setDefaultDomain(String defaultDomain) Set the default domain to be used by the MBeanServer, to be passed to MBeanServerFactory.createMBeanServer() or MBeanServerFactory.findMBeanServer().
void	setLocateExistingServerIfPossible(boolean locateExistingServerIfPossible) Set whether or not the MBeanServerFactoryBean should attempt to locate a running MBeanServer before creating one.
void	setRegisterWithFactory(boolean registerWithFactory) Set whether to register the MBeanServer with the MBeanServerFactory, making it available through MBeanServerFactory.findMBeanServer().

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected final Log logger

Constructor Detail

MBeanServerFactoryBean

public MBeanServerFactoryBean()

Method Detail

setLocateExistingServerIfPossible

public void setLocateExistingServerIfPossible(boolean locateExistingServerIfPossible)

Set whether or not the MBeanServerFactoryBean should attempt to locate a running MBeanServer before creating one.

Default is false.

setAgentId

public void setAgentId(String agentId)

Set the agent id of the MBeanServer to locate.

Default is none. If specified, this will result in an automatic attempt being made to locate the attendant MBeanServer, and (importantly) if said MBeanServer cannot be located no attempt will be made to create a new MBeanServer (and an MBeanServerNotFoundException will be thrown at resolution time).

Specifying the empty String indicates the platform MBeanServer.

See Also:

MBeanServerFactory.findMBeanServer(String)

setDefaultDomain

public void setDefaultDomain(String defaultDomain)

Set the default domain to be used by the MBeanServer, to be passed to MBeanServerFactory.createMBeanServer() or MBeanServerFactory.findMBeanServer().

Default is none.

See Also:

MBeanServerFactory.createMBeanServer(String), MBeanServerFactory.findMBeanServer(String)

setRegisterWithFactory

public void setRegisterWithFactory(boolean registerWithFactory)

Set whether to register the MBeanServer with the MBeanServerFactory, making it available through MBeanServerFactory.findMBeanServer().

See Also:

MBeanServerFactory.createMBeanServer(), MBeanServerFactory.findMBeanServer(java.lang.String)

afterPropertiesSet

public void afterPropertiesSet()
                        throws MBeanServerNotFoundException

Creates the MBeanServer instance.

Specified by:

afterPropertiesSet in interface InitializingBean

Throws:

MBeanServerNotFoundException

locateMBeanServer

protected MBeanServer locateMBeanServer(@Nullable
                                        String agentId)
                                 throws MBeanServerNotFoundException

Attempt to locate an existing MBeanServer. Called if locateExistingServerIfPossible is set to true.

The default implementation attempts to find an MBeanServer using a standard lookup. Subclasses may override to add additional location logic.

Parameters:

agentId - the agent identifier of the MBeanServer to retrieve. If this parameter is null, all registered MBeanServers are considered.

Returns:

the MBeanServer if found

Throws:

MBeanServerNotFoundException - if no MBeanServer could be found

See Also:

setLocateExistingServerIfPossible(boolean), JmxUtils.locateMBeanServer(String), MBeanServerFactory.findMBeanServer(String)

createMBeanServer

protected MBeanServer createMBeanServer(@Nullable
                                        String defaultDomain,
                                        boolean registerWithFactory)

Create a new MBeanServer instance and register it with the MBeanServerFactory, if desired.

Parameters:

defaultDomain - the default domain, or null if none

registerWithFactory - whether to register the MBeanServer with the MBeanServerFactory

See Also:

MBeanServerFactory.createMBeanServer(), MBeanServerFactory.newMBeanServer()

getObject

@Nullable
public MBeanServer getObject()

Description copied from interface: FactoryBean

Return an instance (possibly shared or independent) of the object managed by this factory.

As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding FactoryBeanNotInitializedException.

As of Spring 2.0, FactoryBeans are allowed to return null objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.

Specified by:

getObject in interface FactoryBean<MBeanServer>

Returns:

an instance of the bean (can be null)

See Also:

FactoryBeanNotInitializedException

getObjectType

public Class<? extends MBeanServer> getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance.

This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Specified by:

getObjectType in interface FactoryBean<MBeanServer>

Returns:

the type of object that this FactoryBean creates, or null if not known at the time of the call

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class<T>)

isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

The default implementation returns true, since a FactoryBean typically manages a singleton instance.

Specified by:

isSingleton in interface FactoryBean<MBeanServer>

Returns:

whether the exposed object is a singleton

See Also:

FactoryBean.getObject(), SmartFactoryBean.isPrototype()

destroy

public void destroy()

Unregisters the MBeanServer instance, if necessary.

Specified by:

destroy in interface DisposableBean